Kontakt 4 users - Core Options in C6?

Kontakt 4’s options include core settings of, 2 - 4 - 8 and off, (off, allowing the host to manage memory usage).

NI suggests finding the best settings for your host but doesn’t suggest settings for Cubase or any other daws.

I’m using Win7 x64, core i7, 4 core/8MT/Cubase6 x64 - Kontakt4.
After some quick tests I haven’t seem any significant performance or core usage differences when trying; 4 cores (default), 8 cores and off.

Has anyone explored these options with concrete results?